At the risk of publicly humiliating myself here in front of you guys, I thought i'd recount a quick story about my 'jetting' woes and how I fixed them, so someone else doesn't have to go through what I have for the past six months. About six months ago, all of a sudden, my bike (02 WR426) started running rough and missing in the mid range - which i've noticed is a pretty common issue here. Got some advice and was told it was probably a worn out emulsifier tube in the carby. I replaced this and while i was at it bought a JD Jetting kit to totally eliminate the carby. I've since been right up and down the jetting scale, disconnected the TPS and prayed to no avail, my problem was still there. Was then told its probably my ignition coil. Tested it - all fine. Now I've found out that my spark plug cap was a lose where it attached to the spark plug lead! I've never had the cap off and didn't even think it was the problem. But it was and now, after six months of stuffing around, i've finally got my bike working again! Look for simple things first!!!!!